Added Class utility

README.md

@@ -103,6 +103,7 @@ This gives you the power to prioritize our work and support project contributors
 * [`$Call<T>`](#callt)
 * [`$Shape<T>`](#shapet)
 * [`$NonMaybeType<T>`](#nonmaybetypet)
+* [`Class<T>`](#classt)
 
 ## Deprecated API (use at own risk)
 * `getReturnOfExpression()` - from TS v2.0 it's better to use type-level `ReturnType` instead
@@ -707,6 +708,26 @@ type Name = $NonMaybeType<MaybeName>;
 
 [⇧ back to top](#flows-utility-types)
 
+### `Class<T>`
+
+Given a type T representing instances of a class C, the type Class<T> is the type of the class C  
+https://flow.org/en/docs/types/utilities/#toc-class  
+\* Differs from original Flow's util - implements only constructor part and won't include any static members. Additionally classes in Typescript are not treated as nominal 
+
+**Usage:**
+
+```ts
+import { Class } from 'utility-types';
+
+class Store {}
+
+function makeStore(storeClass: Class<Store>) {
+  return new storeClass();
+}
+```
+
+[⇧ back to top](#flows-utility-types)
+
 ---
 
 MIT License

src/__snapshots__/utility-types.spec.ts.snap

@@ -33,3 +33,5 @@ exports[`$ReadOnly testType<$ReadOnly<Props>>() 1`] = `"_DeepReadonlyObject<Prop
 exports[`$Shape testType<$Shape<Props>>() 1`] = `"Partial<Props>"`;
 
 exports[`$Values testType<$Values<Props>>() 1`] = `"string | number | boolean"`;
+
+exports[`Class testType<Class<Foo>>() 1`] = `"Class<Foo>"`;

src/index.ts

@@ -14,6 +14,7 @@ export {
   $ElementType,
   $Shape,
   $NonMaybeType,
+  Class,
 } from './utility-types';
 
 export {

src/utility-types.spec.snap.ts

@@ -9,6 +9,7 @@ import {
   $ElementType,
   $Shape,
   $NonMaybeType,
+  Class,
 } from './utility-types';
 import { _DeepReadonlyObject } from './mapped-types';
 /**
@@ -18,6 +19,8 @@ import { _DeepReadonlyObject } from './mapped-types';
 type Props = { name: string; age: number; visible: boolean };
 type DefaultProps = { age: number };
 
+class Foo {}
+
 /**
  * Tests
  */
@@ -104,3 +107,9 @@ it('$NonMaybeType', () => {
   // @dts-jest:pass:snap -> string
   testType<$NonMaybeType<string|null|undefined>>();
 });
+
+// @dts-jest:group Class
+it('Class', () => {
+  // @dts-jest:pass:snap -> Class<Foo>
+  testType<Class<Foo>>();
+});

src/utility-types.spec.ts

@@ -9,6 +9,7 @@ import {
   $ElementType,
   $Shape,
   $NonMaybeType,
+  Class,
 } from './utility-types';
 import { _DeepReadonlyObject } from './mapped-types';
 /**
@@ -18,6 +19,8 @@ import { _DeepReadonlyObject } from './mapped-types';
 type Props = { name: string; age: number; visible: boolean };
 type DefaultProps = { age: number };
 
+class Foo {}
+
 /**
  * Tests
  */
@@ -104,3 +107,9 @@ it('$NonMaybeType', () => {
   // @dts-jest:pass:snap
   testType<$NonMaybeType<string|null|undefined>>();
 });
+
+// @dts-jest:group Class
+it('Class', () => {
+  // @dts-jest:pass:snap
+  testType<Class<Foo>>();
+});

src/utility-types.ts

@@ -72,3 +72,10 @@ export type $Shape<T extends object> = Partial<T>;
  * @see https://flow.org/en/docs/types/utilities/#toc-nonmaybe
  */
 export type $NonMaybeType<T> = NonNullable<T>;
+
+/**
+ * Class
+ * @desc Represents constructor of type T
+ * @see https://flow.org/en/docs/types/utilities/#toc-class
+ */
+export type Class<T> = new (...args: any[]) => T;